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1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
Pin Description
PIN
1
2
3
4
5
6
7
8
—
NAME
EN1
CP
CN
EN2
GND
IN
CS
OUT
EP
FUNCTION
Control Logic Input (see Table 1)
Transfer Capacitor Positive Connection. Connect a 1μF capacitor (or 2.2μF for I OUT > 600mA) from
CP to CN.
Transfer Capacitor Negative Connection. Connect a 1μF capacitor (or 2.2μF for I OUT > 600mA) from
CP to CN.
Control Logic Input (see Table 1)
Ground
Input Supply Voltage. Connect IN to a battery or supply voltage from 2.7V to 5.5V. Connect a 4.7μF
ceramic capacitor from IN to GND.
Current-Sense Input. Connect a current-sense resistor from OUT to CS to set the output current.
Connect the anodes of the LEDs to CS and the cathodes to GND.
Output. Connect a 10μF ceramic capacitor from OUT to GND. In shutdown, OUT is pulled to GND
with an internal 5k ? resistor.
Exposed Pad. Connect the exposed pad to GND directly under the IC.
Table 1. Enable, Dimming, Voltage Mode, and Overvoltage Protection
EN1
EN2
DIMMING LEVEL
CS THRESHOLD
(V OUT - V CS )
VOLTAGE MODE
MAX1577Z MAX1577Y
MAX1577Z
OVP
MAX1577Y
0
0
1
1
0
1
0
1
Shutdown
20% Current
33% Current
100% Current
—
60mV
100mV
300mV
—
5.10V
5.10V
5.10V
—
3.40V
4.60V
5.10V
—
5.30V
5.30V
5.30V
—
5.15V
5.17V
5.30V
Note: A “0” indicates EN_ is logic low or connected to GND. A “1” indicates EN_ is logic high or connected to IN.
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